Apart from the question of accents, both overseas and "otherwhere in the
same country", full and semi-illiteracy, and a heavy cold affecting the
recorder's hearing, the invention of the typewriter/computer keyboard
has produced another one:

IGI has APTES for an ancetress. Not one to be found in the whole of
England come 1881. Lots of APTED though.

IGI has LEGASWICK* as a single entry in Dev; but quite a few LEGASSICK*

Type your own variations!

And a note on an 11 generation drop chart we have (known as "The
Ancestor's Folly) has the note that the family surname:

"MAUDSLAY has been spelt 25 different ways in old Writings, Parish
Registers, Wills, &c., and in some cases two and even three different
ways in one single document.

The same name has been spelt two hundred and seventy nine (279)
different ways, collected from 1855 to 1864 on letters, through the
post."